Frost heave and dry density changes during cyclic freeze-thaw of a silty clay
Open-system frost heave tests were performed on a silty clay using a lower boundary condition of +2°C and unidirectional freezing at -10°c from the surface, or freezing and thawing with an upper boundary temperature that cycled from -10°C to +10°C
or from -10°C to 0°C. The amont of frost heave, the distribution of moisture at the end of the experiment and the final dry density profiles all differed for the 3 cases. The experiments demonstrate that freeze-thaw history is important in assessing
Frost heave on earth hummocks (pounus) in Finnish Lapland
Frost heave, frost and snow depths on 2 earth hummocks (pounus) were monitored from 1992 to 2002 in Finnish Lapland. Frost heave was measured with motometers, frost depth with Gandahl's frost tube containing methylene blue, and snow depth with frost
tubes above the ground surface. Frost heave values on the pounus did not differ much from those from the surrounding mire. During the early summer, slow thawing of frost keeps the surface of pounus higher than the surrounding mire surface
Frost heaving and frost creep on an experimental slope : results for soil structures and sorted stripes in Periglacial processes and landforms.
the slope and varied in relation to changes in drainage and temperature gradients. The maximum frost creep occurred in the loamy material at the lower end of the slope where the intensity of the water supply and heaving were greater. Frost creep was shown
Application of differential global positioning systems to monitor frost heave and thaw settlement in tundra environments
This paper describes the methodology employed to resolve vertical changes associated with frost heave and thaw settlement in northern Alaska, at Prudhoe Bay, using differential global positioning systems (DGPS) technology. Traditional profile
) circulation of only fine particles of the ground ; 3) convection of pore water ; 4) heave-settlement pulsation and lateral expansion on the fine domains ; 5) cracking of the ground followed by heave-settlement pulsation and lateral expansion of the centres
This paper presents empirical data on non-sorted patterned ground in the high Drakensberg. Some morphological and sedimentary characteristics for thufur and non-sorted steps are provided. The study also examines process data on ground heave activity
at a thufur site. Contemporary cryogenic activity at the non-sorted steps is indicative that the patterns are at least seasonally active. Soil heave measurements at the Mashai Valley thufur site support the contention that some thufur are active in the high
of the world; their initiation appears closely linked to the unusual environment in which they are found. The debris flows are triggered by sediment mobilization upon saturation of the frost-heaved surface gravel and overland flow over the low-permeability
and frost-susceptible slope materials. Morphological effects of the flows are short-lived due to obliteration by subsequent frost heave activity.